Sheep, goats, octopuses, and toads have rectangular pupils.
7
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Tigers can see 6 times better at night than humans.
305
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21
Those things you see in your eyes when you stare into space are called Mouches Voltanes, which are also broadly referenced to as Floaters.
9
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
The colossal squid has the largest eyes in the world.
4